diff --git a/include/types/proto_http.h b/include/types/proto_http.h
index 9e8bbd5..972a6d3 100644
--- a/include/types/proto_http.h
+++ b/include/types/proto_http.h
@@ -197,6 +197,68 @@
 	STAT_STATUS_SIZE
 };
 
+/* Legacy version of the HTTP/1 message state, used by the channels, should
+ * ultimately be removed.
+ */
+enum h1_state {
+	HTTP_MSG_RQBEFORE     =  0, // request: leading LF, before start line
+	HTTP_MSG_RQBEFORE_CR  =  1, // request: leading CRLF, before start line
+	/* these ones define a request start line */
+	HTTP_MSG_RQMETH       =  2, // parsing the Method
+	HTTP_MSG_RQMETH_SP    =  3, // space(s) after the Method
+	HTTP_MSG_RQURI        =  4, // parsing the Request URI
+	HTTP_MSG_RQURI_SP     =  5, // space(s) after the Request URI
+	HTTP_MSG_RQVER        =  6, // parsing the Request Version
+	HTTP_MSG_RQLINE_END   =  7, // end of request line (CR or LF)
+
+	HTTP_MSG_RPBEFORE     =  8, // response: leading LF, before start line
+	HTTP_MSG_RPBEFORE_CR  =  9, // response: leading CRLF, before start line
+
+	/* these ones define a response start line */
+	HTTP_MSG_RPVER        = 10, // parsing the Response Version
+	HTTP_MSG_RPVER_SP     = 11, // space(s) after the Response Version
+	HTTP_MSG_RPCODE       = 12, // response code
+	HTTP_MSG_RPCODE_SP    = 13, // space(s) after the response code
+	HTTP_MSG_RPREASON     = 14, // response reason
+	HTTP_MSG_RPLINE_END   = 15, // end of response line (CR or LF)
+
+	/* common header processing */
+	HTTP_MSG_HDR_FIRST    = 16, // waiting for first header or last CRLF (no LWS possible)
+	HTTP_MSG_HDR_NAME     = 17, // parsing header name
+	HTTP_MSG_HDR_COL      = 18, // parsing header colon
+	HTTP_MSG_HDR_L1_SP    = 19, // parsing header LWS (SP|HT) before value
+	HTTP_MSG_HDR_L1_LF    = 20, // parsing header LWS (LF) before value
+	HTTP_MSG_HDR_L1_LWS   = 21, // checking whether it's a new header or an LWS
+	HTTP_MSG_HDR_VAL      = 22, // parsing header value
+	HTTP_MSG_HDR_L2_LF    = 23, // parsing header LWS (LF) inside/after value
+	HTTP_MSG_HDR_L2_LWS   = 24, // checking whether it's a new header or an LWS
+
+	HTTP_MSG_LAST_LF      = 25, // parsing last LF
+
+	/* error state : must be before HTTP_MSG_BODY so that (>=BODY) always indicates
+	 * that data are being processed.
+	 */
+	HTTP_MSG_ERROR        = 26, // an error occurred
+	/* Body processing.
+	 * The state HTTP_MSG_BODY is a delimiter to know if we're waiting for headers
+	 * or body. All the sub-states below also indicate we're processing the body,
+	 * with some additional information.
+	 */
+	HTTP_MSG_BODY         = 27, // parsing body at end of headers
+	HTTP_MSG_100_SENT     = 28, // parsing body after a 100-Continue was sent
+	HTTP_MSG_CHUNK_SIZE   = 29, // parsing the chunk size (RFC7230 #4.1)
+	HTTP_MSG_DATA         = 30, // skipping data chunk / content-length data
+	HTTP_MSG_CHUNK_CRLF   = 31, // skipping CRLF after data chunk
+	HTTP_MSG_TRAILERS     = 32, // trailers (post-data entity headers)
+	/* we enter this state when we've received the end of the current message */
+	HTTP_MSG_ENDING       = 33, // message end received, wait that the filters end too
+	HTTP_MSG_DONE         = 34, // message end received, waiting for resync or close
+	HTTP_MSG_CLOSING      = 35, // shutdown_w done, not all bytes sent yet
+	HTTP_MSG_CLOSED       = 36, // shutdown_w done, all bytes sent
+	HTTP_MSG_TUNNEL       = 37, // tunneled data after DONE
+} __attribute__((packed));
+
+
 /* This is an HTTP message, as described in RFC7230. It can be either a request
  * message or a response message.
  *